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Review and Perspective: Gas Separation and Discrimination Technologies for Current Gas Sensors in Environmental
Liang Wang1,2, Ying Cheng1, Saianand Gopalan1
1Global Centre for Environmental Remediation, College of Engineering, Science and Environment, University of Newcastle, Callaghan, New South Wales 2308, Australia.
ACS Sensors
|April 19, 2023
Summary
Advanced gas separation technologies are crucial for accurately monitoring complex mixtures, especially volatile organic compounds (VOCs). This review highlights methods like membranes and metal-organic frameworks for improved environmental gas sensing.
Area of Science:
- Environmental Science
- Analytical Chemistry
- Sensor Technology
Background:
- Current gas sensors (photoionization, electrochemical, optical infrared) often lack selectivity, being affected by interfering analytes.
- Volatile organic compounds (VOCs) frequently exist in complex mixtures, complicating accurate monitoring in environmental applications like vapor intrusion.
Purpose of the Study:
- To review and summarize existing gas separation and discrimination technologies for gas sensors.
- To highlight the potential of these technologies for environmental applications involving complex gas mixtures.
Main Methods:
- Review of current gas sensing technologies and their limitations.
- Analysis of gas separation and discrimination techniques including gas permeable membranes, metal-organic frameworks, microfluidics, and IR bandpass filters.
Main Results:
- Nonselective and semiselective gas sensors are limited by unwanted analytes in mixed gas samples.
- Emerging technologies like membranes and metal-organic frameworks show promise for separating individual VOCs from complex mixtures.
Conclusions:
- Gas separation and discrimination technologies are essential for accurate VOC determination in mixed environmental samples.
- Further development and field application of these technologies are needed for effective vapor intrusion monitoring and complex gas analysis.
Keywords:
electrochemical gas sensorsenvironmental gas sensorsgas separation technologiesoptical infrared sensorsphotoionization detectorsvolatile organic compoundsMore Related Videos
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